Measuring adjacent channel power

Details Measuring adjacent channel power Measuring adjacent channel power

1987-06-11

1989-03-07

Levy, Stewart J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

455 67, G01R 2314

Patent

active

048109606

ABSTRACT:
A signal source from a transmitter is down-converted by being mixed with a locally generated signal so that a desired adjacent channel band is converted to base band and the adjacent channel power measured after filtering by a low pass filter. To eliminate the notch in the filter characteristics that occurs when the power is measured by a.c coupled means, the locally generated signal is modulated or swept around the center of the adjacent channel band.

REFERENCES:
patent: 3327211 (1967-06-01), Taub
patent: 4409544 (1983-10-01), Redlich
Adjecent-Channel Power Meter NKS News From Rohde & Schwarz Brukner et al., vol. 18, No. 83, 1978.
Cable System Measurements, TV Communications by Jeff Thomas, Oct. 1977.
Transmitter Radiation Measuring Methods, Bell Telephone Tech. Pub. by N. Lund Apr. 1950.
Patent Abstracts of Japan, vol. 7, No. 6 Jan. 11, 1983.
Allen P. Edwards, "Precise, Convenient Analysis of Modulated Signals", Hewlett Packard Journal, vol. 30, No. 11 (Nov. 1979):3,9.
European Search Report - Appln. No. 87304843.3 dated 11/17/87.

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